I am looking for some option by which I can run Office XP and Office 2007 on a single pc together. But it looks like impossible. I am very use to Office XP. Now shifted to a new system which has Office 2007. It is somehow a bit complicated t learn it soon. I can use Office XP for my day today task and then open the same in Office 2007 and modify it. What I want that when I install both I want my files to open by default in Office XP instead of Office 2007. I had run the setup. When I tried to install Office XP, it freezes and does not move ahead.